HVAC Technician’s guide on right air condition sizing

Proper A/C Sizing

Having the right size of air conditioner fitted into a room spells a lot of difference when it comes to cooling comfort and electricity bills. Experts advice that every home should have a properly sized air conditioning unit so that they could take full advantage of their a/c unit and operational costs.

The US Department of Energy’s Energy Star explained why it is important to get the right sizing of air conditioning to the room where it is being used. Plumbing Association of San Diego           

“A unit that is too big will be less effective and offer reduced air conditioner efficiency. Air conditioners remove both heat and humidity from the air. If the unit is too large, it will cool the room, before it has a chance to remove the humidity. The result will be a room that’s not very comfortable to spend time in That cool moist air will make the room feel damp and clammy. The most energy efficient air conditioner is sized to the square footage of the space to be cooled.”

Check out the Energy Star’s information table here.

Precise calculation

Homeguides SF Gate meantime explained that there may not be a hard and fast rule when it comes to determining the appropriate capacity of air conditioning unit for a certain room. They explain there is a lot of factors in play such as location of the home, the usual climate, among others. A/C And HVAC     

“To obtain a precise calculation, you must consider your home’s unique factors: What region is it in? How good is the insulation? What direction does the house face? Some websites use online calculators to enable you to perform a closer estimate. An HVAC professional can use the Manual J – an engineering guide that precisely pinpoints the size you need.”

Take a look at the rest of the explanation here.

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Consumer Reports meanwhile shared a rule of thumb approach that some use air conditioning professionals in right-sizing their air conditioning unit. The number though would have to be adjusted in view of factors like the orientation of the sun vis-à-vis the room, the number of occupants in a room, and the type of room where the air conditioning unit will be used.

“Window air conditioners typically have a cooling capacity ranging from 5,000 to 12,500 British thermal units (Btu/hr.). As a rule of thumb, an air conditioner needs 20 Btu for each square foot of living space. But don’t buy by Btu alone. Other considerations, such as the ceiling height and the size of your windows and doorways, might call for more cooling power. To measure your room, multiply the length of the room by the width. Add together the size of rooms that aren’t separated by doors because the air conditioner will need to cool both spaces.”

Check out the rest of the guidelines shared here.

To be sure about the right size of an air conditioning unit, it is best to consult an HVAC Professional.

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5052 Genesee Ave, San Diego, CA 92117

(888) 231-1086

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